AMX VIEWSTAT COMMUNICATING THERMOSTATS User Manual
ViewStat
Communicating Thermostat
instruction manual
HVAC Controls
AMX Limited Warranty and Disclaimer
AMX Corporation warrants its products to be free of defects in material and workmanship under normal use for
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Table of Contents
Table of Contents
Product Information .................................................................................................1
Introduction........................................................................................................................ 1
System Components ......................................................................................................... 2
ViewStat Specifications ..................................................................................................... 2
Support Module Specifications ......................................................................................... 3
Maximum Cable Distances ............................................................................................... 4
HVAC System Pre-Installation Check List......................................................................... 5
ViewStat Installation and Wiring .............................................................................7
Disconnecting Power to All HVAC Equipment .................................................................. 7
Selecting the Thermostat Location.................................................................................... 7
Stand-alone thermostat mounting criteria ................................................................................ 7
With remote temperature sensors............................................................................................ 8
Removing the Faceplate from the Base ............................................................................ 8
Setting the DIP Switch....................................................................................................... 9
Reassembly ............................................................................................................................. 9
Attaching the MiniVerter to the ViewStat......................................................................... 10
Wiring the VST-TSTAT to a VST-DIST Distribution Panel .............................................. 11
Mounting the Base to a Wall ........................................................................................... 13
Connecting the ViewStat to AMX Control Systems......................................................... 13
Connecting to an Axcess Control System (via AXC-232++, AXB-EM232, or Axcent3/PRO) 15
Connecting to an Axcess Master Controller via the RS232/422/485 (DB-9) Port .................. 16
Connecting to NetLinx Integrated Controllers via the RS232/422/485 (DB-9) Port ............... 17
Connecting to a NetLinx Master controller via NXC-COM card ............................................. 18
Connecting to a LandMark Control System ........................................................................... 19
Installing the Cat5 Suppression Ferrite .................................................................................. 19
Connecting to a NetLinx Control System ............................................................................... 20
Connecting to a Landmark Control System ........................................................................... 20
Connecting the ViewStat to the HVAC System ............................................................... 20
Installing the 24 VAC Suppression Ferrite ............................................................................. 20
Wiring the Thermostat .................................................................................................... 21
Communication and Equipment terminal wiring definitions.................................................... 21
Connecting the ViewStat to the HVAC System...................................................................... 22
Checking HVAC System Operation................................................................................. 25
Check Out Procedure............................................................................................................. 25
Optional HVAC Set-Up Features..................................................................................... 26
To access these HVAC set-up features................................................................................. 26
ViewStat Communicating Thermostat
i
Table of Contents
Address the Thermostats and Set Highest Address ....................................................... 27
Wiring Diagrams.............................................................................................................. 29
Single-stage furnace and AC configuration............................................................................ 29
Two-stage furnace and two-stage AC configuration. ............................................................. 30
Roof top unit (two-stage heat and two-stage cool) configuration. .......................................... 31
Boiler with AC (two transformers) configuration..................................................................... 32
Single-stage heat pump configuration.................................................................................... 33
Two-stage heat pump configuration....................................................................................... 34
First- stage radiant floor heat, second-stage furnace one stage of cooling configuration...... 35
Support Module Installation and Wiring ..............................................................37
Installing the VST-TTM and VST-TRH Support Modules................................................ 37
Choosing a mounting location................................................................................................ 37
Single Support Module Installation......................................................................................... 37
Multiple Support Module Installation ...................................................................................... 39
Setting the Support Module DIP Switches ...................................................................... 40
DIP switches 1 and 2: Address (1-4)...................................................................................... 40
Dip switch 4: Humidity Sensor 2 (VST-TRH support module only)........................................ 41
DIP switch 6: T1/T2 or Onboard Sensor ................................................................................ 41
Applications..................................................................................................................... 42
Heat Pump Applications......................................................................................................... 42
Humidity Control (VST-TRH only) .......................................................................................... 42
Troubleshooting Remote Sensors................................................................................... 43
Set Up and Configuration ......................................................................................45
Network Override Set-Up ................................................................................................ 46
Thermostat Button Lockout ............................................................................................. 46
Security Set-Up ............................................................................................................... 47
Communications Set-Up ................................................................................................. 48
Temperature Set-Up ....................................................................................................... 48
Backlighting Set-Up......................................................................................................... 48
Balance Point Set-Up...................................................................................................... 49
Display Set-Up ................................................................................................................ 49
Using the NetLinx Module to Program the ViewStat ........................................... 51
AMX_ViewStat NetLinx Module - Overview .................................................................... 51
The ViewStat Model ........................................................................................................ 53
Command Interface - SEND_COMMANDs..................................................................... 53
String Feedback .............................................................................................................. 59
ii
ViewStat Communicating Thermostat
Table of Contents
Operating the Thermostat ......................................................................................63
Front Panel Components ................................................................................................ 63
Message Display.................................................................................................................... 63
Scroll/Set-up buttons.............................................................................................................. 63
Mode button ........................................................................................................................... 63
Adjust buttons ........................................................................................................................ 64
Fan button .............................................................................................................................. 64
Enter button............................................................................................................................ 64
Main display ........................................................................................................................... 64
Operating The Thermostat .............................................................................................. 65
Selecting the Mode ................................................................................................................ 65
Setting temperatures.............................................................................................................. 66
Fan operation ......................................................................................................................... 66
Backlight operation................................................................................................................. 66
Network override .................................................................................................................... 66
Clearing a temporary flashing message................................................................................. 66
In Case Of Power Failure ................................................................................................ 67
Cleaning the Thermostat ................................................................................................. 67
ViewStat Communicating Thermostat
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Table of Contents
iv
ViewStat Communicating Thermostat
Product Information
Introduction
The ViewStat Communicating Thermostat (FIG. 1) operates similarly to a conventional thermostat
but has the unique capability of being controlled, either locally or remotely from a NetLinx or
Landmark control system. The ViewStat is compatible with any 24-volt controlled HVAC system,
as well as millivolt systems. This manual describes how the ViewStat connects to several different
types (see theViewStat Installation and Wiring section on page 7).
If there are any specific wiring needs or unusual wiring configurations please contact
AMX Technical Support, and we will endeavor to find the answer, before your
installation.
If necessary, contact AMX Technical Support for help with additional specific control wiring
scenarios.
Product Information
Message display
Main display
hinged
front panel
Mode
button
Adjust buttons
Mode button
FIG. 1 ViewStat Communicating Thermostat
Enter button
Fan button
Scroll/Setup
buttons
Communication
terminals
base
HVAC Equipment
terminals
The ViewStat is designed to work with VST-TTM (Temperature) and VST-TRH (Temperature and
Humidity) support modules, and remote sensors.
For information on using the VST-TSTAT with an (optional) VST-DIST Distribution
Panel for RS422 control, refer to the Wiring the VST-TSTAT to a VST-DIST
Distribution Panel section on page 11.
iewStat Communicating Thermostat
1
Product Information
(Cont.)
System Components
The components in a complete ViewStat system (including optional accessories) are listed below:
System Components
Component Name Description
ViewStat (VST) Communicating thermostat
VST-TTM Temperature support module (optional)
VST-TRH Temperature/Humidity support module (optional)
VST-TSF Flush-mount remote sensor Indoor flush-mount temperature/relative humidity sensor (optional)
VST-TSO Duct/Outdoor remote sensor Duct/Outdoor-mount temperature/relative humidity sensor (optional)
VST-DIST Distribution Panel
ViewStat Specifications
ViewStat Specifications
Control Ports • HVAC control
• ICSNet
Control Voltage 24 VAC ±20% or 24 VDC ±20% (delivered by an HVAC system or by an external
power supply)
Switched Voltage 18 – 30 VAC
Maximum Operating Current • 2 amps total at rated voltage, through all outputs.
• 1 amps through any one output.
Maximum Surge Current 2.0 A
Control Accuracy ±1.0° F (± 0.56° C)
Control Range 40° – 90° F (4.44° – 32.22° C)
Operating Range 32° – 99° F (0° – 37.22° C)
Baud Rate 9600
Front Panel Components:
Message display Two types of messages are displayed, Permanent and Temporary Messages.
• Permanent Messages are those that scroll continually during thermostat
operation.
• Temporary (flashing) Messages are intended to catch your eye and must be
reset to be removed from the display.
Thermostats are shipped with default (permanent) status messages (i.e. mode
status, fan status, equipment status).
Scroll/Set-up buttons The Scroll/Set-Up buttons function with the set-up features of the thermostat
(see theSet Up and Configuration section on page 45). These buttons are
located beneath the faceplate.
Main LCD display The MAIN DISPLAY (see FIG. 16 on page 25) provides the mode status, tem-
perature and system status information.
Mode button Five modes of operation are available: OFF, COOL, HEAT, AUTO, and EM.
HEAT (for heat pumps only). The mode of operation indicates how you want
your heating and cooling equipment to operate. This button is located beneath
the faceplate.
Fan button The fan can be operated continuously (FAN ON) or only when there is a need to
heat or cool. This button is located beneath the faceplate.
Enter button The Enter (or Network Override) button is used to override the home automation
system, to clear temporary flashing messages on the message display and with
the set-up features of the thermostat.
Adjust buttons The Adjust buttons adjust the heating and cooling temperature settings.
2
ViewStat Communicating Thermostat
Product Information
ViewStat Specifications (Cont.)
Circuit Board Components:
Communication and HVAC
Equipment connectors
DIP Switch 4-position DIP switch that configures the thermostat for various application types
Enclosure:
Material White plastic with hinged faceplate and removable front panel.
ViewStat Dimensions
(HWD)
Weight 5.29 oz. (150 grams)
Included Accessories • Cat5 Suppression Ferrite
Optional Accessories • VST-TTM Remote Temperature support module (FG944-10)
Remote Temperature
Sensors:
VST-TSF Dimensions: • Cable length: 9.00"(228 mm)
VST-TSO Dimensions
(HWD):
Weight: • VST-TSF: 0.5 lb (0.23 kg)
Terminals with captive-wire connectors that connects the Thermostat, HVAC
equipment, control system, remote sensors and power supply. Refer to the Wir-
ing the Thermostat section on page 21 for details.
(Servant/Master, Electric/Fossil, Single/Multi, Heat Pump/Heat-Cool). Refer to
the Setting the DIP Switch section on page 9 for details.
5.01" x 5.52" x 1.15"
(12.72 cm x 14.02 cm x 2.92 cm)
• 24 VAC Suppression Ferrite
• VST-TRH Remote Temperature/Humidity support module (FG944-20)
• VST-TSF Flush-mount indoor remote sensor (FG944-30)
• VST-TSO Duct/outdoor remote sensor (FG944-40)
• Sensor depth: 0.85" (22 mm)
• Sensor diameter: Ø1.50 (Ø38 mm)
• 2.75" x 1.44" x 1.75
(70 mm x 37 mm x 44 mm)
• VST-TSO: 0.75 lb (0.34 kg)
Support Module Specifications
There are two types of support modules available for the ViewStat:
VST-TTM Temperature Module: The VST-TTM support module offers versatility in
climate control. A set of onboard dip switches on the VST-TTM circuit board allow you
to determine whether you want the two remote temperature sensor inputs to control,
monitor or do a combination of both. This temperature data is sent back to the ViewStat
Thermostat, allowing you to accurately control and monitor temperature in a given area
or multiple areas.
VST-TRH Temperature and Humidity Module: The VST-TRH support module brings
further versatility to the HVAC system. A set of onboard dip switches on the VST-TRH
circuit board allow you to determine whether you want the two remote temperature
sensor inputs to control, monitor, or both. The temperature/humidity data is sent back to
the ViewStat, allowing you to accurately control and monitor temperature/humidity in a
given area or multiple areas.
iewStat Communicating Thermostat
3
Product Information
The ViewStat supports up to four Support Modules, and can display any one of the following:
The remote temperature on support module address 1 if its mode is set to "Control".
The average temperatures of all support modules set to "Control" mode.
The humidity of the VST-TRH (Temperature and Humidity Module) set to "Control"
mode.
VST-TTM and VST-TRH Remote Sensor Specifications
Power supply 18 to 30 VAC or DC (24 V Nominal)
Support Module Dimensions (HWD) 2.50" x 3.50" x 0.88"
(63 mm x 89 mm x 22 mm)
Max. relative humidity 90% (non-condensing)
Temperature:
• Accuracy: Comfort Range: (60°F - 80°F): ± 1°F
Control Range: (40°F - 100°F): ± 2°F
Operating Range: (-40°F - 185°F): ± 3°F
• Maximum Display Range: -40°F - 185°F
Humidity (VST-TRH only):
• Accuracy: Comfort Range: (10% - 45%): ± 3%
Control Range: (10% - 90%): ± 5%
• Maximum Display Range: 0% - 90%
Refer to theSupport Module Installation and Wiring section on page 37 for
information on configuring, installing and wiring the support modules and remote
temperature sensors.
Maximum Cable Distances
Maximum Cable Distances
Between the VST and NetLinx or LandMark Controller: 1000’ (304.8m)
Between support module and VST: 1000’ (304.8m)
•Max. cumulative cable length between multiple support modules and VST: 1000’ (304.8m)
Between support module and remote sensor: 300’ (91.44m)
4
ViewStat Communicating Thermostat
Product Information
HVAC System Pre-Installation Check List
Before getting started, determine what type of heating system is/will be installed in the house. Then
use the following table to determine if the proper numbers of wires are available, depending on the
HVAC System type.
HVAC System Pre-installation Check List
Application # of HVAC Wires Wiring Diagram
Single Stage Furnace & AC 5 FIG. 18 on page 29
Two Stage Furnace & Two Stage AC 7 FIG. 19 on page 30
Roof Top Unit (Two Stage Heat & Two Stage Cool) 7 FIG. 20 on page 31
Boiler with AC (Two Transformers) 5 FIG. 21 on page 32
Single Stage Heat Pump 7 FIG. 22 on page 33
Two Stage Heat Pump 9 FIG. 23 on page 34
First Stage Radiant Floor Heat
Second Stage Furnace One Stage of Cooling 6 FIG. 24 on page 35
In addition to the wires necessary to support the HVAC system control, an RJ45terminated Cat5 cable is necessary to support NetLinx or Landmark communications
(see theViewStat Installation and Wiring section on page 7 for details).
iewStat Communicating Thermostat
5
Product Information
6
ViewStat Communicating Thermostat
ViewStat Installation and Wiring
This section covers the installation, wiring and checkout of a ViewStat Communicating Thermostat
System.
1. 120 volts may cause serious injury from electrical shock. Disconnect electrical power to the
HVAC system before starting installation. This system is a low-voltage system.
2. Improper installation may cause serious injury from electrical shock. This system must be
installed by a qualified contractor in accordance with NEC Standards and applicable local and state
codes.
Disconnecting Power to All HVAC Equipment
Since the ViewStats are wired directly to the HVAC equipment, the power must be shut off at the
equipment. This can generally be accomplished by turning off the disconnect switch located near
the equipment. If an obvious disconnect switch is unavailable, you will need to remove the circuit
breaker or shut down the fuse serving the equipment.
Failure to disconnect power could result in damage to the HVAC equipment or thermostats. Leave
power disconnected until all other electrical connections have been made and checked for
accuracy.
ViewStat Installation and Wiring
Selecting the Thermostat Location
Determine if the thermostat will be operating alone, or with remote temperature sensors. If the unit
is stand-alone there are certain measures that must be taken to ensure accurate temperature control.
Stand-alone thermostat mounting criteria
One ViewStat per HVAC system.
Mount on an interior wall.
In a room frequently occupied.
At least 18 inches (45.72 cm) from any outside wall.
Approximately 5 feet (1.52 m) above the floor. Check with local building codes for height
requirements in commercial applications.
DO NOT locate the thermostat:
Behind doors, in corners or other dead air spaces.
In direct sunlight or near lamps, appliances or other sources of radiant heat.
On an outside wall or wall exposed to an unconditioned space (i.e. garage, etc.).
In the flow path of a supply register, in stairways or near outside doors.
On a wall where concealed pipes and/or duct work will affect the thermostat.
Near sources of electrical interference such as arcing relay contacts.
iewStat Communicating Thermostat
7
ViewStat Installation and Wiring
With remote temperature sensors
Follow the guidelines for placement of the sensors and locate the thermostat indoors where
operating range (see specs) will not be violated (i.e. do not install in a cold garage or hot equipment
room). See the Support Module Installation and Wiring section on page 37 for details.
Removing the Faceplate from the Base
No tools are required to disassemble the thermostat – just use your hands to pull the front panel off
of the base (FIG. 2).
FIG. 2 Pulling the front panel off of the base
Loss of internal programs may result from static discharge to thermostat circuit board.
Touch a grounded metal object to discharge any static charge before handling the
circuit board.
While holding the base of the thermostat, apply pressure to the base of the latch with your thumb
(FIG. 3). Both sides have a latch, but it is easiest to unlatch one side at a time.
Press base
here
FIG. 3 Location of latch on base (one latch on each side)
8
ViewStat Communicating Thermostat
ViewStat Installation and Wiring
Setting the DIP Switch
Set the DIP switch located on the thermostat circuit board (FIG. 4) according to the application
needs (see the DIP Switch Settings table below for details).
FOSSIL
MULTI
ELECTRIC
H/C
SINGLE
HT.PUMP
MASTER
ON
OFF
SERVANT
FIG. 4 Setting the DIP Switch
The following table shows what each switch corresponds to depending on position. Switch one
should be set in the “OFF Servant” position unless you plan to broadcast readings from remote
temperature sensors to other thermostats in the system when there is no control system in place.
DIP Switch Settings
Application Switch #1 Switch #2 Switch #3 Switch #4
Single Stage Furnace & AC Servant Fossil Single H/C
Two Stage Furnace & Two Stage AC Servant Fossil Multi H/C
Roof Top Unit (Two Stage Heat & Two Stage Cool) Servant Fossil Multi H/C
Boiler with AC (Two Transformers) Servant Fossil Single H/C
Single Stage Heat Pump Servant Electric Single HT. Pump
Two Multi-stage Heat Pump Servant Electric Multi HT. Pump
First Stage Radiant Floor Heat,
Second Stage Furnace One Stage of Cooling
Servant Fossil Multi H/C
Reassembly
No tools required – line up pins on circuit board with the corresponding terminal blocks. Use your
hands to push the front panel securely to the mounted base.
iewStat Communicating Thermostat
9
ViewStat Installation and Wiring
C
(black)
Attaching the MiniVerter to the ViewStat
Before attaching the MiniVerter to the rear of the ViewStat, connect the wiring, as described below:
1. Detach the faceplate from the base of the ViewStat.
2. Pull the stripped/tinned wires through the cutout in the center of the base (FIG. 5).
ommon
from 24 VAC
HVAC System
Power (red)
from 24 VAC
HVAC System
Powe r
Terminal
cutout
jumper
from RC
to RH
Equipment
Communication
Te r m in a l
from Miniverter
FIG. 5 ViewStat base with Communication, Power and Equipment terminals
terminal
Before mounting the ViewStat, you must attach the MiniVerter to the rear panel of the ViewStat, as
described below:
1. Detach the faceplate from the base of the ViewStat.
2. Pull the stripped/tinned wires through the cutout in the center of the base (FIG. 5)
3. Connect the communications wiring:
a. Blue to B-
b. Orange to B+
c. Red/White to A-
d. Black/White to A+
4. Connect the power wiring:
a. Black to C
b. Red to R
10
5. Install a jumper from RH to RC.
6. Insert the MiniVerter (connector-side first) into the guide-slots located on the bottom of the
MiniVerter mounting bracket (FIG. 6).
ViewStat Communicating Thermostat
ViewStat Installation and Wiring
ViewStat base (top view)
1
Insert the MiniVerter
(connector-side down)
inside the mounting bracket.
mounting bracket
FIG. 6 Inserting the MiniVerter into the mounting bracket (top view).
into the guide slots
MiniVerter
Snap into place
3
Slide the MiniVerter into
2
locking position in
the bracket.
MiniVerter card
7. Slide the MiniVerter back into its locking position in the mounting bracket.
8. With the connector-side of the MiniVerter seated in the guide-slots, gently press the opposite
side of the MiniVerter in and down, to snap it into its locked position on the mounting bracket.
Repeated installation and removal of the MiniVerter bracket may result in damage to
the bracket.
9. Connect the Cat-5 RJ-45 connector on the MiniVerter to the Control System (Master or ICSNet
Hub).
Wiring the VST-TSTAT to a VST-DIST Distribution Panel
The optional VST-DIST Distribution Panel (not included) connects to up to eight VST-TSTAT
thermostats, providing a convenient and effective method of wiring multiple thermostats to the
control system's RS422 serial interface port.
The VST-DIST provides one RS422 interface to the control system and eight RS422 interfaces for
the thermostats.
Since the VST-DIST provides an RS422 interface to the control system, a MiniVerter
(VST-MVRT) is not required for communication.
The VST-DIST is intended for use with the VST-TSTAT, and is not intended for use with
the VST, which includes a MiniVerter.
The VST-DIST includes an Instruction Manual from the manufacturer with detailed
installation instructions, and a decal on the inside of the front cover (reproduced in
FIG. 7) gives wiring information for the panel.
iewStat Communicating Thermostat
11
ViewStat Installation and Wiring
Communications
Wire to Protocol Adapter,
other Distribution Panels or
directly to Automation System
A: Transmit B: Receive
REF
2
Rx+
Rx-
Tx+
Tx-
Switches
A - Allows Transmit
Communications
B - Allows Received
Communications
PWR - Turns power to
thermostat on/off
LEDs light when
communications are
transmitted (A)
or received (B)
24VAC
GND
3
ADDRESS #
ADDRESS #
ADDRESS #
ADDRESS #
Transformer
24 V, 40 VA minimum
up to 8 thermostats
C - 24 V (common) (-) if DC
R - 24 V (hot) (+) if DC
Main Power Switch
Turns main power to
Distribution Panel on/off
FIG. 7 Wiring the VST-TSTAT to a VST-DIST Distribution Panel
ADDRESS #
ADDRESS #
ADDRESS #
1
LED will light up when
power to thermostat is switched on
4
ADDRESS #
12
ViewStat Communicating Thermostat
ViewStat Installation and Wiring
Mounting the Base to a Wall
There are four screw holes located on the base of the thermostat; two are for a junction box
mounting, along with two for alternate mounting spacing. Use one of the holes on the top and one
on the bottom.
1. Place the base over the wire hole opening in the wall; level the base and mark the screw hole
mounting locations (leveling required for appearance only).
2. If using supplied wall anchors, drill 3/16" hole in the center of the marked locations and tap in
the wall anchors. If using the supplied screws only, drill a 3/32" hole in the center of the
marked locations.
Minimize wire entry hole size and seal – drafts from inside the wall could affect
temperature readings.
3. Fasten the base to the wall with the supplied screws.
4. Seal wire entry using caulk, drywall putty or insulation.
Loss of internal programs may result from static discharge to thermostat circuit board.
Installer must touch a grounded metal object before handling the circuit board.
Connecting the ViewStat to AMX Control Systems
When a Mini Verter is used the Viewstat has a single RJ-45 jack on the rear panel, and uses ICSNet
cabling to connect to NetLinx or Landmark control systems.
The terms "PhastLink" and ICSNet" are essentially interchangeable within the context
of cabling/connectors. They both use a standard 10BaseT type connection (i.e.
Category 5 wire and RJ-45 connectors), and they share the same pinout information
for the RJ-45 jacks. Generally the term "PhastLink" is used when dealing with
Landmark, and "ICSNet" is used when describing NetLinx control systems.
iewStat Communicating Thermostat
13
ViewStat Installation and Wiring
The wires should be connected in the standard manner described in the following table. If standard
EIA/TIA 568A/B color coding is followed, wiring problems will be minimized
PHASTLink RJ-45 Pinout Information (EIA/TIA 568 A)
Pin Wire Color Polarity Function
1 White/Green + Transmit
2 Green - Transmit
3 White/Orange - Mic
4 Blue - Ground
5 White/Blue + 12 VDC
6 Orange + Mic
7 White/Brown + Receive
8 Brown - Receive
TIA 568A
1 2 3 4 5 6 7 8
.
(female)
NetLinx RJ-45 Pinout Information (EIA/TIA 568 B)
Pin Wire Color Polarity Function
1 Orange/White + Transmit
2 Orange - Transmit
3 Green/White - Mic
4 Blue - Ground
5 White/Blue + 12 VDC
6 Green + Mic
7 White/Brown + Receive
8 Brown - Receive
TIA 568B
It is important that the correct pairing is observed. Transmit, Receive, and Mic
need to be on twisted pairs. Splitting pairs (e.g., using a white/green wire with a blue/
white wire for transmit) will result in increased crosstalk, and may result in bus failure
or noise on the intercom.
1 2 3 4 5 6 7 8
(male)
RJ-45 connector pin configurations
14
ViewStat Communicating Thermostat
ViewStat Installation and Wiring
Connecting to an Axcess Control System (via AXC-232++, AXB-EM232, or Axcent3/ PRO)
To connect the ViewStat to an Axcess control system via an Axcess Cardframe (cardframe must be
equipped with an AXC-232 232/422/485 Control Card), AXB-EM232 Enhanced Master, or
Axcent3(PRO) Controller, refer to the card-edge pinout information below:
Axcess System Card Edge Pinouts
Pin Signal Function
1 GND Ground (RS-232)
2 RX Receive data (RS-232)
3 TX Transmit data (RS-232)
4 +12V Power
5 RX - Receive data (RS-422)
6 RX + Receive data (RS-422)
7 TX - Transmit data (RS-422)
8 TX + Transmit data (RS-422)
9 GND Ground
10 CTS Clear-to-send (hardware handshaking)
11 RTS Ready-to-send (hardware handshaking)
12-16 not used
FIG. 8 shows the wiring configuration for Axcess systems:
ViewStat
(Communication
terminal)
FIG. 8 Connecting the ViewStat to an Axcess Control System
Axcess
Control
System
AXC-232(++)
or
AXB-232(++)
iewStat Communicating Thermostat
15
ViewStat Installation and Wiring
Connecting to an Axcess Master Controller via the RS232/422/485 (DB-9) Port
The table below lists the connector pins, signal types, and signal functions for RS-232/RS-422/RS-
485 DB-9 (male) connector on an Axcess Master Controller (i.e. Axcent3 or Axcent3/PRO).
DB-9 Pinouts Wiring and Baud Configurations
Pin Signal Function RS-232 RS-422 RS-485
1 RX- Receive data X X (strap to pin 9)
2 RXD Receive data X
3 TXD Transmit data X
4 TX+ Transmit data X X (strap to pin 6)
5 GND Signal ground X X
6 RX+ Receive data X X (strap to pin 4)
7 RTS Request to send X
8 CTS Clear to send X
9 TX- Transmit data X X (strap to pin 1)
FIG. 9 shows the wiring configuration for Axcess systems (using the DB-9 PROGRAM port).
The X’s show where to terminate the wires on the DB-9 connector.
16
ViewStat
(Communication
terminal)
FIG. 9 Connecting the ViewStat to an Axcess Control System via the RS232/422/485 (DB-9) port
RS232/422/485
Por t
ViewStat Communicating Thermostat
ViewStat Installation and Wiring
Connecting to NetLinx Integrated Controllers via the RS232/422/485 (DB-9) Port
The table below lists the connector pins, signal types, and signal functions for RS-232/RS-422/RS-
485 DB-9 (male) connector on an NetLinx Integrated Controllers (i.e. NI-2000/3000/4000).
DB-9 Pinouts Wiring and Baud Configurations
Pin Signal Function RS-232 RS-422 RS-485
1 RX- Receive data X X (strap to pin 9)
2 RXD Receive data X
3 TXD Transmit data X
4 TX+ Transmit data X X (strap to pin 6)
5 GND Signal ground X X
6 RX+ Receive data X X (strap to pin 4)
7 RTS Request to send X
8 CTS Clear to send X
9 TX- Transmit data X X (strap to pin 1)
The X’s show where to terminate the wires on the DB-9 connector.
FIG. 9 shows the wiring configuration for NetLinx systems (using the DB-9 PROGRAM port).
ViewStat
(Communication
terminal)
FIG. 10 Connecting the ViewStat to an NetLinx Integrated Control System via the RS232/422/485 (DB-9) port
iewStat Communicating Thermostat
RS232/422/485
Por t
17
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